time-darwin.cpp revision cacc4e75dbbff469c10a505168208f064c6c385c
/* $Id$ */
/** @file
* innotek Portable Runtime - Time, Darwin.
*/
/*
* Copyright (C) 2006-2007 innotek GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License as published by the Free Software Foundation,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#define RTTIME_INCL_TIMEVAL
#include <mach/mach_time.h>
#include <mach/kern_return.h>
#include <sys/time.h>
#include <time.h>
#include <iprt/time.h>
#include "internal/time.h"
DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
{
static struct mach_timebase_info s_Info = { 0, 0 };
static double s_rdFactor = 0.0;
/* get the factors the first time (pray we're not racing anyone) */
if (s_Info.denom == 0)
{
static bool s_fFailedToGetTimeBaseInfo = false;
if (!s_fFailedToGetTimeBaseInfo)
{
struct mach_timebase_info Info;
if (mach_timebase_info(&Info) != KERN_SUCCESS)
{
s_rdFactor = (double)Info.numer / (double)Info.denom;
s_Info = Info;
}
else
{
s_Info.denom = s_Info.numer = 0;
s_fFailedToGetTimeBaseInfo = true;
}
}
}
/* special case: absolute time is in nanoseconds */
if (s_Info.denom == 1 && s_Info.numer == 1)
return mach_absolute_time();
/* general case: multiply by factor to get nanoseconds. */
if (s_rdFactor != 0.0)
return mach_absolute_time() * s_rdFactor;
/* worst case: fallback to gettimeofday(). */
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * (uint64_t)(1000 * 1000 * 1000)
+ (uint64_t)(tv.tv_usec * 1000);
}
/**
* Gets the current nanosecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns nanosecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current millisecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns millisecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current system time.
*
* @returns pTime.
* @param pTime Where to store the time.
*/
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
/** @todo find nanosecond API for getting time of day. */
struct timeval tv;
gettimeofday(&tv, NULL);
return RTTimeSpecSetTimeval(pTime, &tv);
}